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In page Mortido:
"Mortido was introduced by Freud's pupil Paul Federn to cover the psychic energy of the death instinct, something left open by Freud himself:[1] Edoardo Weiss preferred to use destrudo.[2] Providing what he saw as clinical proof of the reality of the death instinct in 1930, Federn reported on the self-destructive tendencies of severely melancholic patients as evidence of what he would later call inwardly-directed mortido.[3]
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